Since no-one's answered, I'll have a go. I see no reason not to use both, provided you realise that stacking filters *can* lead to vignetting and *does* increase the number of glass/air interfaces. As for what the effect will be with B&W and whether it's worthwhile, I'm not sure at all.
Zorki: 1e (x2), 2C, 3M, 4, 4K, 5, 6
FED: NKVD, 1g, 2e, 3a, 3b, 4L (x2), 5B, 5C
Kiev 4, 4A
Yashica Minister III
Zenith C, Zenit C, Zenit E
Minolta XG M, Z1
"The way to see by faith is to shut the eye of reason."- Benjamin Franklin